Uchiha Fugaku ran away, but left behind the Mangekyo Sharingan.
Letting Uchiha Fugaku leave was also the Great Elder's decision. Although Uchiha Yoichi did not take action last night, the Great Elder saw that Uchiha Yoichi and Uchiha Fugaku were almost at the point of a life-and-death struggle.
Moreover, Uchiha Fugaku was utterly defeated, not being Uchiha Yoichi's opponent in any aspect. Staying in Konoha could very well lead to his death.
However, the Great Elder believed Uchiha Fugaku might die during a mission, so he hoped Uchiha Fugaku could leave and hide in the Ninja World.
A mere clan leader struggle doesn't require such extreme retreat. If defeated, just yield the position, but there was clearly a deeper hatred between the two, leading them to fight to the death.
Now, Uchiha Fugaku was clearly no match for Uchiha Yoichi, severely injured and under watch, having lost even his position as clan leader.
So, to stay alive, it was better for him to leave the Uchiha Race.
Uchiha Yashiro also believed it would be better for Uchiha Fugaku to leave the clan lands and Konoha, so he entrusted a medical ninja to use Mystical Palm Jutsu to speed up his healing, letting his injuries recover by thirty or forty percent overnight, allowing him to wake up.
Using Mystical Palm Jutsu to stimulate cell division can speed up healing, but it is a method that overdrafts the body, generally leaving aftereffects even after healing; unless encountered with an urgent task on the battlefield, this method wouldn't be easily used.
After Uchiha Fugaku awoke, he deeply felt the gap between himself and Uchiha Yoichi, having listened to Uchiha Yashiro's words.
Revenge?
This was no longer something that mere training could accomplish. He had already awakened the Mangekyo, does it mean he should become like Uchiha Madara in the past?
Though decades have passed since Madara's incident, the upper echelons of the Uchiha Race all knew about it. After all, this was the legend of him and the First Generation Hokage Senju Hashirama co-founding Konoha Village.
Back then, Madara and his brother both had Mangekyo Sharingan, and Madara took his brother's Sharingan, replacing them and gaining a power even stronger than the Mangekyo.
With no hope of revenge on his own, Uchiha Fugaku thought of this matter, and his son.
If he left with the Mangekyo, Uchiha Yoichi would definitely not let him go, surely hunting him throughout the entire Ninja World, so he planned to leave the Mangekyo to Itachi, entrusting Yashiro to properly mentor Itachi; in Fugaku's eyes, Uchiha Itachi would surely become a ninja surpassing himself.
Thus, he transplanted an ordinary Three-Tomoe, so even if in the future he's captured in the Ninja World by Uchiha Yoichi, he wouldn't be able to obtain his eyes then.
Uchiha Fugaku's plan was well thought out, but he didn't expect that Uchiha Yoichi had murderous intent towards Uchiha Itachi, and it was also detected by Uchiha Yashiro.
Thus, after weighing the options, Uchiha Yashiro decided to put out Uchiha Fugaku's Mangekyo Sharingan in exchange for Uchiha Itachi's safe growth.
"Senior Yashiro, this really makes it difficult for me...."
Uchiha Yoichi tapped his fingers on the table with furrowed brows, his anger now somewhat subsided but not completely extinguished.
Without the Mangekyo Sharingan, Uchiha Fugaku ceased to be a significant threat, even if he had the Three-Tomoe, it was no threat to him, or perhaps had never been a threat from the start.
But having an adversary who was alive and fleeing was deeply disturbing for Uchiha Yoichi.
"This morning when I was returning from the offices of the three Hokage, I drafted the members of the clan to go to support Kikyo Castle, Mr. Yashiro, who do you think should lead the team?"
"Let me lead the team, Clan Leader, I definitely will not disgrace the name of Uchiha; as for the position of Squad Leader, please select another clan member to take my place."
Upon hearing this, Uchiha Yashiro felt slightly relieved, considering this perhaps his ultimate destination.
From the moment Uchiha Yoichi entered just now, he felt surviving would be difficult; from the moment he sent off Fugaku, he had this realization that if he didn't make sacrifices, then Uchiha Itachi... wouldn't eventually fulfill Fugaku's entrustment.
Although he sent off the Mangekyo Sharingan, at least Uchiha Itachi was still alive.
"Please give me a day to arrange things, Clan Leader."
"Gather at the Security Team by noon tomorrow."
After saying this, Uchiha Yoichi stood up, simultaneously taking Uchiha Fugaku's Sharingan.
Once Uchiha Yoichi left, Uchiha Yashiro felt somewhat relieved, for at least having protected Uchiha Itachi.
Though Uchiha Yashiro was previously pondering whether to send Uchiha Itachi to Mikota, Fugaku instructed him, even at the cost of his life, not to do so, which made Uchiha Yashiro abandon the idea.
Now, he could only entrust Itachi to another clan member, under the guise of apprenticeship, to avoid Uchiha Mikota reclaiming him.
As for himself, he could only give his all on the battlefield.
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Leaving Uchiha Yashiro's house, Uchiha Yoichi looked at the two Mangekyo, keeping them well preserved.
How to utilize these two Mangekyo was something he genuinely could not decide at the moment.
If used to fuse the abilities himself, it was highly possible to fuse pupil power to awaken the Eternal Mangekyo, but if so, Uchiha Fugaku's pupil technique would vanish.
Fusing pupil power does not necessarily mean inheriting the pupil technique, so that would be somewhat wasteful.
Uchiha Fugaku's pupil technique akin to Izanagi and Yin-Yang Transformation was something that even Uchiha Yoichi greatly envied; Uchiha Fugaku's pupil power was insufficient, unable to bring out the true value of this technique.